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When the ventricles contract, atrioventricular valves close to prevent blood from flowing back into the atria. When the ventricles relax, semilunar valves close to prevent blood from flowing back into the ventricles.
Atrioventricular Valves Function. Av Valves Function. There are four valves, pulmonary, mitrial,tricuspid and aortic in the heart. There is an AV(atrioventricular) node within the heart. When the heart is in diastole, at rest 1/10th second, an electrical impulse begins to emanate from the sinoatrial node. Atrial systole is bought about by the impulse for the sinoatrial node spreading over the artia.